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Erratum to: Effect of Conductivity Type and Doping Level of Silicon Crystals on the Size of Formed Pore Channels during Anodic Etching in Hydrofluoric Acid Solutions Tech. Phys. (IF 0.603) Pub Date : 2021-03-01 G. G. Zegrya; V. P. Ulin; A. G. Zegrya; N. V. Ulin; V. M. Frayman; Yu. M. Mikhailov
An Erratum to this paper has been published: https://doi.org/10.1134/S106378422102016X
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Specific Features in Mechanical Behavior of Ring-Shaped Force Drives Operating in the Two-Way Shape Memory Effect Regime Tech. Phys. (IF 0.603) Pub Date : 2021-03-01 N. N. Belousov; E. A. Khlopkov; M. V. Yanchenko; Yu. N. Vyunenko
Abstract We have analyzed the possibility of improving deformation–force properties of ring-shaped drives made of titanium nickelide and operating in the regime of two-way shape memory effect (TWSME). For this purpose, thermocycling of an oval sample was used with the transformation of the material from the low-temperature martensite phase to the high-temperature austenite phase in free state and cooling
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X-Ray Photoelectron Spectroscopy of Nanodiamonds Obtained by Grinding and Detonation Synthesis Tech. Phys. (IF 0.603) Pub Date : 2021-03-01 P. P. Sharin; A. V. Sivtseva; V. I. Popov
Abstract The initial composition and chemical state of nanopowder primary particles obtained by grinding natural diamond and detonation synthesis have been studied by X-ray photoelectron spectroscopy. It has been shown that the primary particles of both nanopowders contain mainly carbon and oxygen atoms. The signals from nitrogen, sulfur, chlorine, and metal atoms in the photoelectronic spectrum do
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Autowave Description of Plasticity of Materials with an Unstable Phase Structure at the Macroscale Level Tech. Phys. (IF 0.603) Pub Date : 2021-03-01 V. I. Danilov; L. B. Zuev; V. V. Gorbatenko; L. V. Danilova; D. V. Orlova
Abstract We consider the regularities of a plastic flow in materials with strain-induced phase transformation in titanium nickelide and trip steel as examples. The experimental analysis of plastic deformation processes has been carried out using the technique of digital correction of speckle images, which makes it possible to describe quantitatively the behavior of plasticity fronts associated with
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Generation of a Photoacoustic Response of a Two-Layer Polymer/Gel Structure Tech. Phys. (IF 0.603) Pub Date : 2021-03-01 D. A. Andrusenko; A. N. Alekseev; A. G. Kuzmich; M. M. Lazarenko; S. V. Vasilyuk; R. M. Burbelo
Abstract Generation processes of a photoacoustic response of a layered polyethylene/hydrogel structure by its irradiation with periodically modulated light have been experimentally studied. The heat sources are located in a gel near the interface with polyethylene. The response in the form of the pressure oscillations occurs as a result of the thermoelastic strain of the polyethylene layer by its
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Pseudogap, Nanocrystals and Electrical Conductivity of Doped Silicate Glass Tech. Phys. (IF 0.603) Pub Date : 2021-03-01 G. Abdurakhmanov; V. I. Shimanski; B. Oksengendler; B. Umirzahov; A. N. Urokov
Abstract The ideas of pseudogap and nanocrystals have applied to mechanism of electrical conduction in silicate glass doped by oxides of transition metals (thick film resistors). Pseudogap is formed near the valence band of the glass due to diffusion of dopant atoms into the glass in calcination. Nanocrystals are generated in the glass in melting process and undergo structure transitions at high temperatures
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The Topography of Surface and Light Transmission by Quartz Windows after Exposure in a High-Frequency Discharge in Deuterium and Mixture of Deuterium with Nitrogen Tech. Phys. (IF 0.603) Pub Date : 2021-03-01 A. E. Gorodetsky; A. V. Markin; V. L. Bukhovets; V. I. Zolotarevsky; R. Kh. Zalavutdinov; N. A. Babinov; A. M. Dmitriev; A. G. Razdobarin; E. E. Mukhin
Abstract The effect of a high-frequency discharge on the change in the topography of the surface of KU-1 optical quartz and transmission of visible light (400–1000 nm) is studied. The working gases of the discharge are D2 and a D2/N2 mixture, in which the fraction of N2 is 25 mol %. The addition of nitrogen increases the rate of sputtering from 60 to 300 nm/h without changing the stoichiometry of the
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Computing Method for Designing a Thermostat for Laboratory Tests of Infrared Optoelectronic Systems Tech. Phys. (IF 0.603) Pub Date : 2021-03-01 I. Yu. Dmitriev; A. A. Kotmakova; Yu. A. Rezunkov
Abstract A model of a thermal vacuum system (thermostat) for regulation and stabilization of temperature of the primary mirror of a cooled optical collimator for carrying out tests of optoelectronic equipment operating in the infrared region is designed. An original method for solving the system of nonlinear equations of radiative heat transfer in a thermostat is developed, and the uniformity of the
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The Influence of Nonconductive Disk-Shaped Inclusions on the DC Conductivity of Materials Tech. Phys. (IF 0.603) Pub Date : 2021-03-01 L. I. Stefanovich
Abstract The influence of nonconductive disk-shaped inclusions (cracks) on the dc conductivity of a conducting medium has been considered. The functional dependences of an additional relative resistivity of the material on cracking factor (joining ratio) have been found for thin and thick samples. It has been found that the cracking-induced additional relative resistivity of a thick conducting material
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The Giant Magnetoresistance Effect in Microwave Reflection from (CoFe)/Cu Superlattices Tech. Phys. (IF 0.603) Pub Date : 2021-03-01 A. B. Rinkevich; E. A. Kuznetsov; D. V. Perov; M. A. Milyaev
Abstract Experiments on the giant magnetoresistance effect observed in microwave reflection have been conducted in the frequency range of 26–38 GHz on (CoFe)/Cu superlattices exhibiting giant magnetoresistance. The amount of the effect has been determined (up to +3% maximum), and its magnetic field dependence has been found. The microwave reflection coefficient versus magnetic field dependence has
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Peculiarities of the Discharge Formation in a Plasma Accelerator and Structure of a Jet Flowing into Vacuum Tech. Phys. (IF 0.603) Pub Date : 2021-03-01 V. Yu. Goryainov; M. E. Viktorov; A. V. Vodop’yanov; A. V. Voronin
Abstract We report on results of investigation into the structure of a plasma jet generated by a coaxial plasma accelerator with conical insert in the discharge formation region. Using high-speed optoelectronic camera, we detected an inhomogeneous structure of glowing fractions of argon and deuterium jets. It was found that the jet radiation intensity oscillates with a characteristic frequency of 0
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Investigation of Radiation Erosion in a Gas Discharge Detector by Atomic-Force Microscopy Tech. Phys. (IF 0.603) Pub Date : 2021-03-01 M. E. Buzoverya; G. E. Gavrilov; O. E. Maev
Abstract Atomic-force microscopy methods were used to study specimens of cathodes of multiwire proportional chambers subjected to a long-term exposure to a β-source 90Sr in the course of laboratory longevity tests. The changes in the surface morphology of the copper foil at the detector cathode that have occurred as a result of action of an electron beam have been described. The quantitative estimate
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Peaks of Hydrogen Thermal Desorption: Simulation and Interpretation Tech. Phys. (IF 0.603) Pub Date : 2021-03-01 Yu. V. Zaika; E. K. Kostikova; Yu. S. Nechaev
Abstract Different models of hydrogen thermal desorption peaks have been analyzed. The model of volume-averaged concentration dynamics with a continuum parameter makes it possible to integrally take into consideration the dominance of limiting factors: diffusion and recombination of atoms into desorbing molecules. An analytical symmetry criterion for peaks versus the method of expanding a composed
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Otto–Kretschmann Hybrid Configuration for Excitation of Different Modes of Surface Plasmon–Polaritons Tech. Phys. (IF 0.603) Pub Date : 2021-03-01 S. V. Tomilin; A. V. Karavaynikov; O. A. Tomilina; V. N. Berzhansky
Abstract Results of simulation, synthesis, and investigation of a double-resonance plasmon structure for excitation of different modes of surface plasmon–polaritons are presented. It is shown that a combination of the Kretschmann and Otto configurations on a single asymmetric multilayer structure can be used for excitation of the plasmon–polariton resonances. Parameters of such a structure are optimized
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Modeling of Molten Corium Oxidation in the Presence of an Oxide Crust on the Melt Surface Tech. Phys. (IF 0.603) Pub Date : 2021-03-01 V. B. Khabensky; V. I. Almjashev; V. S. Granovsky; E. V. Krushinov; S. A. Vitol; S. Yu. Kotova; V. V. Gusarov
Abstract In the case of a severe accident at a nuclear power plant with light-water reactors, the most effective method for localization of the formed melt (corium) is its retention in the cooled reactor vessel whose integrity depends on the heat flux from the melt to the vessel. One of the critically important processes in this case is the oxidation of the melt by water vapor or air–vapor mixture
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Measurement of Essentially Nonstationary Heat Fluxes by a Bismuth-Based Gradient Sensor Tech. Phys. (IF 0.603) Pub Date : 2021-03-01 Yu. V. Dobrov; V. A. Lashkov; I. Ch. Mashek; A. V. Mityakov; V. Yu. Mityakov; S. Z. Sapozhnikov; R. S. Khoronzhuk
Abstract The gradient heat flux sensor made of a bismuth single crystal is calibrated. The volt–watt sensitivity of the sensor is determined and the method of data processing based on the 1D heat conduction equation for a thin plate is proposed. This method is tested on experimental data obtained for the initiation of a laser discharge in a calm atmosphere and in a supersonic gas flow.
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Analysis of Absorbing Periodic Structures Formed by Cylindrical Electromagnetic Black Holes Tech. Phys. (IF 0.603) Pub Date : 2021-03-01 Ya. I. Chizhevskaya; O. N. Smolnikova; S. P. Skobelev
Abstract A 2D problem of electromagnetic plane wave scattering by 1D-periodic structures with cylindrical elements of electromagnetic black hole type arranged on a semi-infinite substrate is considered. Two algorithms corresponding to the cases of E- and H-polarization are developed on the basis of the hybrid projection method with accounting for refractive index distributions in the black holes of
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Dynamics of the Spatial Structure of a Microsecond Pulsed Barrier Discharge Initiated in Atmospheric Pressure Air in the Point–Plane Geometry at Different Polarities of Feed Voltage Tech. Phys. (IF 0.603) Pub Date : 2021-03-01 A. A. Tren’kin; K. I. Almazova; A. N. Belonogov; V. V. Borovkov; E. V. Gorelov; I. V. Morozov; S. Yu. Kharitonov
Abstract The evolution of a microsecond pulsed barrier discharge initiated in atmospheric pressure air in the point–plane electrode geometry has been investigated using streak camera photorecording and shadow photography with micrometer resolution and nanosecond exposure. It has been shown that the discharge develops in series and its structure evolves both within a series and from series to series
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Sensitivity of Reflecting Terahertz Sensors of Aqueous Solutions Tech. Phys. (IF 0.603) Pub Date : 2021-03-01 A. B. Sotsky; M. M. Nazarov; S. S. Miheev; L. I. Sotskaya
Abstract Sensitivity of sensors of aqueous solutions in which a terahertz signal is reflected from a structure consisting of a dielectric film and solution is studied. The maximum sensitivity is reached at angles of incidence and radiation frequencies that provide zero reflection of monochromatic radiation from the specified structure. Conditions for such reflection are determined for the s- and p-polarized
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Advanced Technologies for Applied Particle Accelerators and Examples of Their Use (Review) Tech. Phys. (IF 0.603) Pub Date : 2021-03-01 S. V. Kutsaev
Abstract This review presents the author’s view on modern trends in the development of charged particle accelerators for various applications, which is based on his own experience in this research field. The most promising, in the author’s opinion, areas of application of resonance accelerators are shown, in which substantial progress has been made by using new technologies. The use of high-gradient
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Dynamics of 5-Aminolevulinic Acid-Induced Accumulation of Protoporphyrin IX in Three Cell Lines of Different Origin Tech. Phys. (IF 0.603) Pub Date : 2021-02-28 D. A. Gorbenko, A. V. Belashov, T. N. Belyaeva, E. S. Kornilova, I. K. Litvinov, I. V. Semenova, O. S. Vasyutinskii
Abstract The dynamics of synthesis and accumulation of protoporphyrin IX induced by 5-aminolevulinic acid (5-ALA) was studied using confocal fluorescence microscopy in three established cell lines: immortalized cells originated from human tumor tissues—epithelial carcinoma (HeLa cells) and lung adenocarcinoma (A549 cells)—and immortalized fibroblast-like mouse embryo cells (3T3 line). The accumulation
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Two-Phase State of the Crystal Structure of (1 – x )PbFe 2/3 W 1/3 O 3 – x PbTiO 3 Solid Solutions ( x = 0.25, 0.3, and 0.35) at Room Temperature Tech. Phys. (IF 0.603) Pub Date : 2021-02-28 N. V. Zaitseva, A. A. Naberezhnov, E. P. Smirnova
Abstract The evolution of the crystal structure of (1 – x)PbFe2/3W1/3O3 – xPbTiO3 solid solutions depending on the PbTiO3 concentration (at x = 0.25, 0.3, and 0.35) near the morphotropic phase boundary has been investigated using X-ray diffraction at room temperature. It is established that all three compositions are mixtures of the cubic and tetragonal phases and that an increase in the PbTiO3 concentration
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Thermal Conductivity and Thermoelectric Power of Compounds in the Cu–Ge–As–Se System Tech. Phys. (IF 0.603) Pub Date : 2021-02-28 O. P. Shchetnikov, N. V. Melnikova, A. N. Babushkin, V. M. Kiseev
Abstract The influence of temperature (in the interval of 300–400 K) and concentrations on the electrical conductivity, thermal conductivity, and thermoelectric power of copper chalcogenide-based crystals with the general formula (GeSe)1 – x(CuAsSe2)x has been considered. Heat transfer mechanisms have been determined. It has been found that the temperature dependence of thermal conductivity is nonmonotonic
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Computer Modelling of Uniaxial Tension of Functionally Gradient Material Produced by Additive Manufacturing Tech. Phys. (IF 0.603) Pub Date : 2021-02-28 V. Sh. Sufiiarov, A. V. Orlov, E. V. Borisov, I. A. Polozov, A. A. Popovich, M. O. Chukovenkova, A. V. Soklakov, D. S. Mikhaluk
Abstract In this paper, the authors suggested a finite element approach to the simulation of mechanical properties of functionally graded materials (FGM) using a multilinear plastic material model. The approach was used to simulate tensile test experiments on the homogeneous specimens manufactured at two laser power regimes and composite specimens based on the materials considered. We showed a correlation
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On the Size Distribution of Dispersed Fractal Particles Tech. Phys. (IF 0.603) Pub Date : 2021-02-28 V. B. Fedoseev, A. V. Shishulin
Abstract Using a thermodynamic approach, a disperse system formed by an ensemble of particles with various shapes and volumes is studied. The shape of a particle is set by the value of its fractal dimension, which characterizes the relationship between the volume and surface area. Using the methods of number theory and the Hardy–Ramanujan–Rademacher formula, the size distribution functions of the dispersed
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Method of Translation Transfer for Estimation of Stability of a Nonstationary Quantum Frequency Standard Tech. Phys. (IF 0.603) Pub Date : 2021-02-28 S. V. Bozhokin, K. A. Barantsev, A. N. Litvinov
Abstract A continuous wavelet transform is used to analyze operation of a nonstationary signal of a quantum frequency standard. A method of translation transfer is proposed for elimination of the boundary effects in such a transform. Spectral integrals of the signal of the quantum frequency standard are calculated in several frequency intervals. A wavelet variance is introduced to determine time moments
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Synthesis and Investigation of Magnesium–Aluminum Nanopowders and Ceramics Activated by Copper Tech. Phys. (IF 0.603) Pub Date : 2021-02-28 V. V. Osipov, V. I. Solomonov, A. V. Podkin, V. A. Shitov, E. V. Tikhonov, A. S. Korsakov
Abstract Nanopowders of two crystalline phases, magnesium–aluminum spinel (98 wt %), and cuprite (2 wt %) have been obtained by laser evaporation of a solid target, which is a mechanical mixture of simple oxides (MgO, Al2O3, CuO). These nanopowders have been used to prepare test samples of transparent Cu:MgAl2O4 ceramics, the IR transmission spectra of which revealed two new strong absorption bands
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Low-Frequency Noise in Light-Emitting Diodes Based on InGaN/GaN Quantum Wells under Electric Actions Accompanied with an Increase in the External Quantum Efficiency Tech. Phys. (IF 0.603) Pub Date : 2021-02-28 A. M. Ivanov
Abstract The results of testing the degradation of light-emitting diode structures with InGaN/GaN quantum wells are reported. An increase in the external quantum efficiency as compared to the initial value is observed after the passage of current of 150–170 mA. Possible physical processes leading to a change in the quantum efficiency and an increase in low-frequency noise are considered.
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A Study of the Spatial Charge Effect on 2-MeV Proton Beam Transport in an Accelerator-Based Epithermal Neutron Source Tech. Phys. (IF 0.603) Pub Date : 2021-02-28 T. A. Bykov, D. A. Kasatov, Ia. A. Kolesnikov, A. M. Koshkarev, A. N. Makarov, G. M. Ostreinov, E. O. Sokolova, S. Yu. Taskaev, I. M. Shchudlo
Abstract A neutron source composed of a tandem accelerator with vacuum insulation and a lithium target is used to develop the boron neutron capture therapy and other applications. The dependence of the proton beam size on the target surface on the beam current is measured with thermocouples inserted inside the target and with a infrared camera. It is found that there is no appreciable influence of
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A Method for Calculating of Нeating Closed High-Current Electric Contacts by Pulsed Currents Tech. Phys. (IF 0.603) Pub Date : 2021-02-28 M. A. Pavleino, O. M. Pavleino, M. S. Safonov
Abstract We propose an original method for numerical calculation of heating of high-current electric contacts in the closed state by pulsed currents with a duration comparable with the period of the industrial-frequency current. Such regimes are typical of current-carrying systems of high-voltage electric facilities during switching high-power loads, during failure in electric transmission lines, and
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Resistive Switching Effect of the Structure Based on Silicon Nitride Tech. Phys. (IF 0.603) Pub Date : 2021-02-28 F. F. Komarov, I. A. Romanov, L. A. Vlasukova, I. N. Parkhomenko, A. A. Tsivako, N. S. Koval’chuk
Abstract The electrophysical properties and the resistive switching effect in ITO/SiNx/Si memristor structures have been investigated. A silicon nitride film ~200 nm thick with a Si/N ratio varying with depth has been deposited on a silicon substrate by chemical vapor deposition. The current–voltage characteristics of ITO/SiNx/Si-p structures have shown that the conduction mechanism in a high-resistivity
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Determination of the Magnetic Moment of a 23 Na Nucleus Using an NMR Spectrometer with Simultaneous Detection of Signals from Two Nuclei Tech. Phys. (IF 0.603) Pub Date : 2021-02-28 Yu. I. Neronov
Abstract Experimental results on measuring the resonance frequency ratio of the protons of water and of 23Na nuclei in NaCl solutions with concentrations from 0.1 to 0.5 g per 100 g H2O are presented. Signals of water protons and sodium nuclei were acquired simultaneously, which allowed minimizing random and systematic uncertainties in measurements of the ratio of resonance frequencies f(H2O)/f(23Na+)
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The Influence of the Thickness of Silicon- and Oxygen-Doped Hydrogenized Carbon Films on Their Surface Properties Tech. Phys. (IF 0.603) Pub Date : 2021-02-28 A. S. Grenadyorov, A. A. Solov’ev, K. V. Oskomov
Abstract Hydrogenized carbon films 0.5–7.0 μm thick doped with silicon (11.9 ± 0.4 at %) and oxygen (1.7 ± 0.1 at %) have been grown on VT-6 titanium and silicon substrates in an externally heated arc discharge plasma. The hardness, internal stresses, surface morphology, wettability, and surface potential of the films against their thickness have been studied. It has been found that as the film gets
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The Influence of Space-Charge-Limited Current on the Dielectric Properties of Polycrystalline Films of Fullerite C 60 Tech. Phys. (IF 0.603) Pub Date : 2021-02-28 D. I. Dolzhenko, V. F. Borodzyulya, I. B. Zakharova, N. T. Sudar’
Abstract The dielectric properties of polycrystalline fullerite films with a thickness of ~300 nm included in p-Si/C60/InGa structures under dc electric fields with a strength up to 3.3 × 107 V/m have been investigated in the frequency range of 30–106 Hz. It is established that, at negative polarity of an InGa electrode (when electron injection from the metal to fullerite is facilitated), an anomalous
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Heat Conduction Beyond the Fourier Law Tech. Phys. (IF 0.603) Pub Date : 2021-02-28 A. I. Zhmakin
Abstract The Fourier law correctly describes heat transport in most practical macroscopic problems. However, for heat transfer in rapid processes, heat transport on micro- and nanoscales, and heat transfer in materials with an internal structure (porous media and biological tissues), other models are required that take into account nonlinear effects, as well as temporal (memory) and spatial nonlocality
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Quasi-Stationary Approximation in the Problem of Excitation of Low-Frequency Electromagnetic Fields in Lithosphere Tech. Phys. (IF 0.603) Pub Date : 2021-02-28 E. D. Tereshchenko, P. E. Tereshchenko
Abstract Excitation of electromagnetic field at ultralow, extremely low, and lower frequencies by a horizontal grounded antenna in a two-layer medium is considered. Approximate analytical formulas are derived to describe field evolution in the low-frequency range. Accuracy of the quasi-stationary approximation is analyzed. Substitution of the impedance of a plane wave that is normally incident on the
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The Use of Medium-Energy Atom Beams for Solid-State PIXE Diagnostics Tech. Phys. (IF 0.603) Pub Date : 2021-02-28 I. T. Serenkov, V. I. Sakharov
Abstract The possibilities of using medium-energy (hundreds of kiloelectronvolts) ion beams for diagnostics of solids by measuring the spectra of characteristic X-ray radiation are considered. A modification of the method is proposed that consists in using probing beams of neutral atoms. It is shown that the use of such beams makes it possible to eliminate the negative effect of the surface potential
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Trajectory Analysis in a Collector with Multistage Energy Recovery for a DEMO Prototype Gyrotron. Part I. Idealized Magnetic Field Distribution Tech. Phys. (IF 0.603) Pub Date : 2021-02-28 O. I. Louksha, P. A. Trofimov, V. N. Manuilov, M. Yu. Glyavin
Abstract This paper presents the results of simulation of the collector of a prototype gyrotron designed for the DEMO project. Trajectory analysis in a collector with four-stage recovery of the residual beam energy based on the method of spatial separation of electrons in crossed azimuthal magnetic and axial electric fields was carried out. In this part of the research, the azimuthal magnetic field
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Structural Features and Optical Properties of Nominally Pure LiNbO 3 Crystals Grown from a Charge Containing B 2 O 3 Tech. Phys. (IF 0.603) Pub Date : 2021-02-28 R. A. Titov, V. M. Voskresenskiy, N. V. Sidorov, N. A. Teplyakova, M. N. Palatnikov
Abstract It is shown that application of B2O3 as a flux allows one to obtain nominally pure composition-homogeneous LiNbO3 crystals characterized by high, close-to-stoichiometry ordering of structural units of the cation sublattice and high resistance to laser radiation. It have been established by calculations that boron can be incorporated into faces of oxygen tetrahedra of the LiNbO3 crystal structure
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Peculiarities of Reflection of Electromagnetic Waves in the Microwave Range from Magnetic Colloids Tech. Phys. (IF 0.603) Pub Date : 2021-02-28 S. D. Turkin, Yu. I. Dikansky
Abstract We have investigated experimentally the reflection of an electromagnetic (EM) wave in the microwave range at a frequency of 10.65 GHz from a layer of a magnetic fluid (magnetic colloid) and composites synthesized on its basis. It is found that, upon an increase in the solid-phase concentration, the conditions for the emergence of ferromagnetic resonance in the homogeneous magnetic colloid
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Studying the Optical and Structural Properties of Three-Dimensional InGaP(As) Islands Formed by Substitution of Elements of the Fifth Group Tech. Phys. (IF 0.603) Pub Date : 2020-12-11 A. G. Gladyshev, A.V. Babichev, V. V. Andryushkin, D. V. Denisov, V. N. Nevedomskii, E. S. Kolodeznyi, I. I. Novikov, L. Ya. Karachinsky, A. Yu. Egorov
Abstract A new method for the formation of three-dimensional quantum-dimensional InGaP(As) islands is proposed, which consists in replacing phosphorus with arsenic in an InGaP layer deposited on GaAs directly during epitaxial growth. It is shown that the replacement of phosphorus with arsenic results in formation of three-dimensional islands in the thin InGaP layer. At room temperature, these islands
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A Bipolar Transistor-Based High-Power Chaotic Oscillator with Selected Inertia Tech. Phys. (IF 0.603) Pub Date : 2020-12-11 S. V. Savel’ev, L. A. Morozova
Abstract The feasibility of creating a high-power wideband source of chaotic microwave signals that is constructed around a single high-power bipolar transistor has been demonstrated for the first time. This has become possible after implementing a selected-inertia oscillator. Theoretical calculations supporting the idea of fabricating such an oscillator are presented. A hybrid integrated prototype
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Plastic Relaxation of Stressed Semipolar AlN( $$10\bar {1}1$$ ) Layer Synthesized on a Nanopatterned Si(100) Substrate Tech. Phys. (IF 0.603) Pub Date : 2020-12-11 V. N. Bessolov, E. V. Konenkova, V. N. Panteleev
Abstract Plastic relaxation of a stressed semipolar AlN(\(10\bar {1}1\)) layer synthesized on a nanopatterned Si(100) substrate has been investigated using scanning electron microscopy. It is shown that the application of a nanorelief consisting of triangular nanogrooves with inclined faces close to the Si(111) plane in a semipolar AlN layer can lead to the formation of cracks only in the direction
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Spatial Characteristics of Superconductors and a 3D Hall Microscope for Their Analysis Tech. Phys. (IF 0.603) Pub Date : 2020-12-11 Kh. R. Rostami
Abstract Based on Hall probes, a scanning microscope with a survey area of 5 × 5 mm has been developed and used for high-spatial-resolution and sensitivity measurements of the topology of magnetic field B(X, Y, Z) on the surface of and around the YBa2Cu3O7 – x and Bi2Sr2CaCu2O8 + x samples without resorting to electrodynamics expressions. The differential technique with the fixation of the beginning
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The Influence of Metallurgical Factors on Stress Corrosion Cracking of Various Steels in an Aggressive Chloride–Sulfide Environment Tech. Phys. (IF 0.603) Pub Date : 2020-12-11 A. I. Petrov, M. V. Razuvaeva
Abstract The influence of metallurgical factors on stress corrosion cracking of steels of different classes in an aggressive NACE solution at 25°C is analyzed. The dependences of the stress leading to the transition from active corrosion to the mechanism of hydrogen embrittlement (critical stress) on the yield stress and the coefficient of stress concentration are plotted. The relationship between
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The Effect of Plasma Density on the Degree of Suppression of Analyte Signals in ICP-MS Tech. Phys. (IF 0.603) Pub Date : 2020-12-11 T. K. Nurubeyli
Abstract Possible effects of ionization phenomena on the analytical signal in inductively coupled plasma mass spectrometry with a high-temperature ion source are considered. The dependences of the degree of suppression of ion signals on the electron density are calculated and experimentally determined for ions of matrix and impurity elements. It is shown that the degree of signal suppression depends
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Thermal Conductivity of Water-in-Oil Emulsions Tech. Phys. (IF 0.603) Pub Date : 2020-12-11 V. G. Kucherov
Abstract A correlation for calculating the thermal conductivity of binary dispersed systems depending on their composition is proposed. The results of measuring the thermal conductivity of reverse type water-in-oil emulsions at a pressure of up to 20 MPa in the temperature range of 293–353 K with a change in the volumetric water content in the emulsion up to 50% are presented. The obtained correlation
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Determination of Temperature Dependence of Thermophysical Parameters in Solids: Numerical Solution of the Problem Tech. Phys. (IF 0.603) Pub Date : 2020-12-11 A. A. Obukhov, T. A. Novikova, V. G. Lebedev, V. I. Lad’yanov, A. V. Obukhov
Abstract Two approaches one presented to determine the thermophysical properties of materials. Necessary experimental data on thermal curves have been extracted by simulation modeling of the heat propagation process based on numerically solving the 1D thermal conductivity equation. The thermal conductivity and thermal diffusivity coefficients have been calculated independently using a method suggested
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A Study of Electrical Characteristics of Crystals of Homogeneously Doped LiNbO 3 :Zn,Mg in the Temperature Range of 450–900 K Tech. Phys. (IF 0.603) Pub Date : 2020-12-11 M. N. Palatnikov, V. A. Sandler, N. V. Sidorov, S. M. Masloboeva, O. V. Makarova
Abstract In a series of initially polydomain crystals of LiNbO3:Zn,Mg obtained by the homogeneous doping of the crystals in the concentration ranges of around 1 ± 0.02 mol % MgO and 3.0–4.6 mol % ZnO, abrupt increases in temperature dependences of electrical conductivity σ(T) and dielectric constant ε(T) with the manifestation of low-frequency dielectric dispersion are observed near T* ≈ 800 K. At
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Soot Formation during the Decomposition of Chlorine-Containing Hydrocarbons with an AC Plasma Torch Tech. Phys. (IF 0.603) Pub Date : 2020-12-11 N. V. Obraztsov, D. I. Subbotin, A. V. Surov, V. E. Popov, E. O. Serba
Abstract The process of decomposition of organochlorine compounds by a three-phase ac plasma torch with vortex arc stabilization is studied. The plasma torch had two zones for introducing the plasma-forming media: the near-electrode and arc-burning zones. The near-electrode zone was fed with a shielding gas, and the arc-burning was fed with water vapor, methane, and vapors of organochlorine compounds
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Mechanisms of Stress Generation in Thin Films and Coatings Tech. Phys. (IF 0.603) Pub Date : 2020-12-11 A. R. Shugurov, A. V. Panin
Abstract Analysis of the literature data on the reasons for the development of mechanical stresses in epitaxial, polycrystalline, and amorphous films during their formation and under various external influences is carried out. The mechanism of the appearance of internal stresses during heteroepitaxial growth of films caused by the mismatch of the crystal lattice constants of the film and substrate
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High-frequency Magnetotransport in a thin Metal Layer with Variable Specularity Coefficients of its Boundaries Tech. Phys. (IF 0.603) Pub Date : 2020-12-11 P. A. Kuznetsov, O. V. Savenko, A. A. Yushkanov
Abstract A theoretical model of the conductivity of a thin metal layer placed in a longitudinal constant magnetic and alternative electric field is constructed, taking into account the diffuse-mirror boundary conditions. An analytical expression is obtained for the integral conductivity as a function of dimensionless parameters: layer thickness, electric field frequency, magnetic field induction and
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Plasma Dynamic Synthesis of Nanocrystalline WC 1 – x and the Dependence of the Product Structure on the Ratio of Precursors Tech. Phys. (IF 0.603) Pub Date : 2020-12-11 A. A. Sivkov, I. I. Shanenkov, Yu. L. Shanenkova, I. A. Rakhmatullin, A. S. Ivashutenko, D. S. Nikitin, A. R. Nasyrbaev
Abstract The results of plasma dynamic synthesis of nanocrystalline cubic tungsten carbide using a system based on a coaxial magnetoplasma accelerator are presented. It is found that an atomic ratio of C/W precursors of about 2.5 is necessary to achieve the maximum yield of the unique cubic phase of tungsten carbide WC1 – x (up to 95%). The synthesized materials are analyzed by transmission electron
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Resonance Properties of a Low-Pressure Dielectric Barrier Discharge Tech. Phys. (IF 0.603) Pub Date : 2020-12-11 V. M. Bocharnikov, V. V. Volodin, V. V. Golub, I. V. Trifanov, D. G. Serebryakov
Abstract The electrical characteristics of a dielectric barrier discharge (DBD) symmetrical actuator at low pressures gave been investigated. A power source–actuator–DBD system has been analyzed. The plot of the feed voltage frequency at which a voltage resonance is observed at the outer electrodes of an actuator with a given configuration against air pressure has been constructed. The DBD density
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Ion Dynamics in an Atmospheric Source with Photoionization by Radiation of Laser Plasma Tech. Phys. (IF 0.603) Pub Date : 2020-12-11 R. S. Ablizen, M. A. Monastyrskiy, M. G. Skoblin, A. V. Pento, A. B. Bukharina, S. M. Nikiforov, A. A. Makarov
Abstract A pulsed source of ions with ionization of the substance under study at atmospheric pressure by the UV radiation of laser plasma is numerically simulated. The calculations are based on an original mathematical model that describes evolution of an ensemble of ions in the presence of superimposed gas-dynamic and electric fields with allowance for the Coulomb interaction. The model contains a
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Formation of Free Electrons in Collisions of Xe Atoms with α Particles Tech. Phys. (IF 0.603) Pub Date : 2020-12-11 A. A. Basalaev, M. N. Panov, O. V. Smirnov
Abstract We have measured the cross sections of elementary processes occurring during collisions of impinging 3He2+ particles with kinetic energies in the range 1–100 keV with Xe atoms, which are accompanied with the formation of free electrons and ions in different final charge states: Xen+ (n = 1–6) and He(2 – m)+ (m = 0–2). We distinguish between ionization processes, in which the impinging α particle
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Specific Features of the Distribution of Nonuniform Electrostatic Field in a System with Variable Configuration of Electrodes That Generates High-Voltage Gas Discharge Tech. Phys. (IF 0.603) Pub Date : 2020-12-11 M. A. Markushin, V. A. Kolpakov, S. V. Krichevskii
Abstract A model of the distribution of nonuniform electrostatic field is proposed for a system with variable configuration of electrodes that generates high-voltage discharge. It is shown that conformal mapping of a function of complex variable can be used for analytical study of the distribution of field equipotential lines depending on the diameter of a circular orifice in the anode (D = 1–5 mm)
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An Investigation of the Conductive and Ferroelectric Properties of BZT Films Tech. Phys. (IF 0.603) Pub Date : 2020-12-11 E. V. Gushchina, B. R. Borodin, V. A. Sharov, V. V. Osipov, S. I. Pavlov, M. A. Yagovkina, M. S. Dunaevskii
Abstract Local polarization processes in BaTi1 – xZrxO3 thin films are studied using contact conductive scanning probe microscopy and piezoelectric response microscopy. The relationship between the direction of the created domains and the magnitude of the flowing currents is established. The value of the residual polarization is found. Using scanning probe microscopy, the hysteresis loop is measured
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The Influence of Silicon Dioxide on the Stability of the Phase Composition and Mechanical Properties of Alumina-Toughened Zirconia-Based Ceramics Tech. Phys. (IF 0.603) Pub Date : 2020-12-11 A. A. Dmitrievskii, A. O. Zhigachev, D. G. Zhigacheva, V. V. Rodaev
Abstract The influence of SiO2 impurity (with a concentration varying from 0 to 10 mol %) on the stability of tetragonal ZrO2 (t-ZrO2) and on a set of micro- and macromechanical properties of calcia-stabilized (CCaO = 6.5 mol %) alumina-toughened (\({{C}_{{{\text{A}}{{{\text{l}}}_{2}}{{{\text{O}}}_{3}}}}}\) = 5.8 mol %) zirconia-based ceramics (ATZ ceramics) has been studied. It has been found that
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Analysis of the Liquid–Cluster State of Melts near the Melting Point Tech. Phys. (IF 0.603) Pub Date : 2020-12-11 V. D. Aleksandrov, A. P. Zozulya, O. A. Pokyntelytsia, N. V. Shchebetovskaya
Abstract We have analyzed the available data on the transition from equilibrium crystallization of melts of various substances to nonequilibrium explosive crystallization depending on preliminary heating of the liquid phase to temperature \(T_{C}^{ + }\). Analogously to the liquid-crystal state, superheating interval Δ\(T_{L}^{ + }\) = \(T_{C}^{ + }\) – TL relative to melting temperature TL is ascribed
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